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J. FRIBERG and O. NILSSON

Summary.

Human spermatozoa agglutinated head-to-head by sperm-agglutinating antibodies have been examined by means of scanning electron microscopy. Two types of union were observed, that between the anterior and middle parts of the sperm heads, and a second type where the anterior part of the head of the sperm cell attached to the postnuclear cap region of another spermatozoon. The possible significance of these findings is briefly discussed.